冷泉碳酸盐岩的稀土元素地球化学特征及氧化还原条件示踪
Rare earth elements of seep carbonates and using them to trace redox variation at seep sites
查看参考文献54篇
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文摘
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在海底冷泉活动区渗漏甲烷被细菌缺氧氧化为HCO_3~-,产生碳酸盐岩沉淀,同时消耗沉积物孔隙水中的硫酸根离子,从而改变沉积环境的氧化还原条件。墨西哥湾和刚果扇的现代冷泉碳酸盐岩及摩洛哥HollardMound中泥盆统和意大利Marmorito中新统冷泉碳酸盐岩的泥晶和亮晶碳酸盐矿物的稀土元素(rareearthelement,REE)总量(∑REE)质量分数变化范围较大(0.3×10-6—43.7×10-6),泥晶的∑REE高于亮晶碳酸盐矿物。稀土元素页岩标准化配分模式具有不同的Ce异常特征,即使在同一地点采集的样品也表现出不同的Ce异常,显示了冷泉活动区海底除目前认识到的还原环境外,至少存在局部和短暂的氧化环境。氧化还原条件的改变可能与冷泉流体流动速率变化有关,或与甲烷缺氧氧化伴生的反硝化作用产生的氧有关。 |
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其他语种文摘
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At marine seeps, methane is microbially oxidized resulting in the precipitation of carbonate close to the seafloor. Methane oxidation leads to sulfate depletion in sediment pore water and induces change in redox conditions. Rare earth element (REE) patterns of authigenic carbonate phases from limestone collected from modern seeps of the Gulf of Mexico and the Congo Fan, as well as from two ancient hydrocarbon-seep localities, Hollard Mound (Middle Devonian) and Marmorito (Miocene), were investigated. The total REE content (∑REE) of seep carbonates varies widely from 0.3×10~(-6) to 43.7×10~(-6), with a common trend that the ∑REE in microcrystalline phases is higher than that in sparite cement. The shale-normalized REE patterns of seep carbonates often show different Ce anomalies, even in the samples from the same site. These varied Ce anomalies suggested that the redox conditions of seep carbonates are variable and complex. Overall, our results show that oxic conditions are at least temporarily common in seep environment. The varied redox conditions might be related to the changes of flux of seep fluid or the denitrification associated with methane oxidation that produces oxygen. |
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来源
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热带海洋学报
,2012,31(5):37-44 【核心库】
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关键词
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冷泉碳酸盐岩
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氧化还原条件
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稀土元素示踪
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地址
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1.
中国科学院广州地球化学研究所, 中国科学院边缘海地质重点实验室, 广东, 广州, 510640
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中国科学院广州地球化学研究所, 中国科学院边缘海地质重点实验室;;中国科学院边缘海地质重点实验室, 广东, 广州, 510640
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语种
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中文 |
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ISSN
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1009-5470 |
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学科
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地质学 |
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基金
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广东省科技计划项目
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中国科学院广州地球化学研究所 “135”项目
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中国科学院“百人计划”项目
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中国科学院知识创新工程重要方向项目
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文献收藏号
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CSCD:4755220
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